Estimated absolute magnitude in the r band (M_r) and estimated metallicity ([Fe/H]) for group A for the sources typically considered as halo stars (blue) and those that we have selected as near-MSTO stars (red). The sources selected as halo members meet 0.2 <g − r< 0.3 and g,r,i> 17. The subset of near-MSTO stars, additionally meets M_r> − 2, −2.5 ≤ [Fe/H] ≤ 0 and 0.1 <g − i< 0.6.